You are the network administrator for your company. The network consists of a single Active Directory domain. All network servers run Windows Server 2003. A server named Server54 hosts all shared documents for the legal and human resources departments. Server54 is frequently accessed and updated throughout the business day. Users report extremely slow response times when they try to open the shared documents. You log on to Server54 and observe real-time data indicating that the processor is operating at 100 percent of capacity. Now you need to gather additional data to diagnose the cause of the problem. What should you do? （）

A. In System Monitor, create an alert that will be triggered when processor usage exceeds 80 percent for more than five minutes.
B. In Event Viewer, open and review the application log for System Monitor events.
C. In Task Manager, review the Processes tab to see the percentage of processor capacity used by each application.
D. In the Performance console, create a counter log to track processor usage.